Tooltip

<div class="tt-stage">
  <div class="tt-wrap">
    <button type="button" class="tt-trigger" id="ttTrigger" aria-describedby="ttBubble">
      What does "seat" mean?
    </button>
    <div class="tt-bubble" id="ttBubble" role="tooltip">
      One seat equals one active teammate.
    </div>
  </div>
</div>